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Linux 2.6.19-rc1
[linux-2.6/next.git] / drivers / acpi / hardware / hwregs.c
blob3143f36fcec9f50caa5b3320191a5c1086a5ab18
1
2 /*******************************************************************************
3 *
4 * Module Name: hwregs - Read/write access functions for the various ACPI
5 * control and status registers.
6 *
7 ******************************************************************************/
8
9 /*
10 * Copyright (C) 2000 - 2006, R. Byron Moore
11 * All rights reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions, and the following disclaimer,
18 * without modification.
19 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
20 * substantially similar to the "NO WARRANTY" disclaimer below
21 * ("Disclaimer") and any redistribution must be conditioned upon
22 * including a substantially similar Disclaimer requirement for further
23 * binary redistribution.
24 * 3. Neither the names of the above-listed copyright holders nor the names
25 * of any contributors may be used to endorse or promote products derived
26 * from this software without specific prior written permission.
27 *
28 * Alternatively, this software may be distributed under the terms of the
29 * GNU General Public License ("GPL") version 2 as published by the Free
30 * Software Foundation.
31 *
32 * NO WARRANTY
33 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
34 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
35 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
36 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
37 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
38 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
39 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
41 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
42 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
43 * POSSIBILITY OF SUCH DAMAGES.
44 */
45
46 #include <acpi/acpi.h>
47 #include <acpi/acnamesp.h>
48 #include <acpi/acevents.h>
49
50 #define _COMPONENT ACPI_HARDWARE
51 ACPI_MODULE_NAME("hwregs")
52
53 /*******************************************************************************
54 *
55 * FUNCTION: acpi_hw_clear_acpi_status
56 *
57 * PARAMETERS: Flags - Lock the hardware or not
58 *
59 * RETURN: none
60 *
61 * DESCRIPTION: Clears all fixed and general purpose status bits
62 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
63 *
64 * NOTE: TBD: Flags parameter is obsolete, to be removed
65 *
66 ******************************************************************************/
67 acpi_status acpi_hw_clear_acpi_status(u32 flags)
68 {
69 acpi_status status;
70 acpi_cpu_flags lock_flags = 0;
71
72 ACPI_FUNCTION_TRACE(hw_clear_acpi_status);
73
74 ACPI_DEBUG_PRINT((ACPI_DB_IO, "About to write %04X to %04X\n",
75 ACPI_BITMASK_ALL_FIXED_STATUS,
76 (u16) acpi_gbl_FADT->xpm1a_evt_blk.address));
77
78 lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
79
80 status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
81 ACPI_REGISTER_PM1_STATUS,
82 ACPI_BITMASK_ALL_FIXED_STATUS);
83 if (ACPI_FAILURE(status)) {
84 goto unlock_and_exit;
85 }
86
87 /* Clear the fixed events */
88
89 if (acpi_gbl_FADT->xpm1b_evt_blk.address) {
90 status =
91 acpi_hw_low_level_write(16, ACPI_BITMASK_ALL_FIXED_STATUS,
92 &acpi_gbl_FADT->xpm1b_evt_blk);
93 if (ACPI_FAILURE(status)) {
94 goto unlock_and_exit;
95 }
96 }
97
98 /* Clear the GPE Bits in all GPE registers in all GPE blocks */
99
100 status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block);
101
102 unlock_and_exit:
103 acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
104 return_ACPI_STATUS(status);
105 }
106
107 /*******************************************************************************
108 *
109 * FUNCTION: acpi_get_sleep_type_data
110 *
111 * PARAMETERS: sleep_state - Numeric sleep state
112 * *sleep_type_a - Where SLP_TYPa is returned
113 * *sleep_type_b - Where SLP_TYPb is returned
114 *
115 * RETURN: Status - ACPI status
116 *
117 * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested sleep
118 * state.
119 *
120 ******************************************************************************/
121
122 acpi_status
123 acpi_get_sleep_type_data(u8 sleep_state, u8 * sleep_type_a, u8 * sleep_type_b)
124 {
125 acpi_status status = AE_OK;
126 struct acpi_evaluate_info *info;
127
128 ACPI_FUNCTION_TRACE(acpi_get_sleep_type_data);
129
130 /* Validate parameters */
131
132 if ((sleep_state > ACPI_S_STATES_MAX) || !sleep_type_a || !sleep_type_b) {
133 return_ACPI_STATUS(AE_BAD_PARAMETER);
134 }
135
136 /* Allocate the evaluation information block */
137
138 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
139 if (!info) {
140 return_ACPI_STATUS(AE_NO_MEMORY);
141 }
142
143 info->pathname =
144 ACPI_CAST_PTR(char, acpi_gbl_sleep_state_names[sleep_state]);
145
146 /* Evaluate the namespace object containing the values for this state */
147
148 status = acpi_ns_evaluate(info);
149 if (ACPI_FAILURE(status)) {
150 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
151 "%s while evaluating SleepState [%s]\n",
152 acpi_format_exception(status),
153 info->pathname));
154
155 goto cleanup;
156 }
157
158 /* Must have a return object */
159
160 if (!info->return_object) {
161 ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]",
162 info->pathname));
163 status = AE_NOT_EXIST;
164 }
165
166 /* It must be of type Package */
167
168 else if (ACPI_GET_OBJECT_TYPE(info->return_object) != ACPI_TYPE_PACKAGE) {
169 ACPI_ERROR((AE_INFO,
170 "Sleep State return object is not a Package"));
171 status = AE_AML_OPERAND_TYPE;
172 }
173
174 /*
175 * The package must have at least two elements. NOTE (March 2005): This
176 * goes against the current ACPI spec which defines this object as a
177 * package with one encoded DWORD element. However, existing practice
178 * by BIOS vendors seems to be to have 2 or more elements, at least
179 * one per sleep type (A/B).
180 */
181 else if (info->return_object->package.count < 2) {
182 ACPI_ERROR((AE_INFO,
183 "Sleep State return package does not have at least two elements"));
184 status = AE_AML_NO_OPERAND;
185 }
186
187 /* The first two elements must both be of type Integer */
188
189 else if ((ACPI_GET_OBJECT_TYPE(info->return_object->package.elements[0])
190 != ACPI_TYPE_INTEGER) ||
191 (ACPI_GET_OBJECT_TYPE(info->return_object->package.elements[1])
192 != ACPI_TYPE_INTEGER)) {
193 ACPI_ERROR((AE_INFO,
194 "Sleep State return package elements are not both Integers (%s, %s)",
195 acpi_ut_get_object_type_name(info->return_object->
196 package.elements[0]),
197 acpi_ut_get_object_type_name(info->return_object->
198 package.elements[1])));
199 status = AE_AML_OPERAND_TYPE;
200 } else {
201 /* Valid _Sx_ package size, type, and value */
202
203 *sleep_type_a = (u8)
204 (info->return_object->package.elements[0])->integer.value;
205 *sleep_type_b = (u8)
206 (info->return_object->package.elements[1])->integer.value;
207 }
208
209 if (ACPI_FAILURE(status)) {
210 ACPI_EXCEPTION((AE_INFO, status,
211 "While evaluating SleepState [%s], bad Sleep object %p type %s",
212 info->pathname, info->return_object,
213 acpi_ut_get_object_type_name(info->
214 return_object)));
215 }
216
217 acpi_ut_remove_reference(info->return_object);
218
219 cleanup:
220 ACPI_FREE(info);
221 return_ACPI_STATUS(status);
222 }
223
224 ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data)
225
226 /*******************************************************************************
227 *
228 * FUNCTION: acpi_hw_get_register_bit_mask
229 *
230 * PARAMETERS: register_id - Index of ACPI Register to access
231 *
232 * RETURN: The bitmask to be used when accessing the register
233 *
234 * DESCRIPTION: Map register_id into a register bitmask.
235 *
236 ******************************************************************************/
237 struct acpi_bit_register_info *acpi_hw_get_bit_register_info(u32 register_id)
238 {
239 ACPI_FUNCTION_ENTRY();
240
241 if (register_id > ACPI_BITREG_MAX) {
242 ACPI_ERROR((AE_INFO, "Invalid BitRegister ID: %X",
243 register_id));
244 return (NULL);
245 }
246
247 return (&acpi_gbl_bit_register_info[register_id]);
248 }
249
250 /*******************************************************************************
251 *
252 * FUNCTION: acpi_get_register
253 *
254 * PARAMETERS: register_id - ID of ACPI bit_register to access
255 * return_value - Value that was read from the register
256 * Flags - Lock the hardware or not
257 *
258 * RETURN: Status and the value read from specified Register. Value
259 * returned is normalized to bit0 (is shifted all the way right)
260 *
261 * DESCRIPTION: ACPI bit_register read function.
262 *
263 * NOTE: TBD: Flags parameter is obsolete, to be removed
264 *
265 ******************************************************************************/
266
267 acpi_status acpi_get_register(u32 register_id, u32 * return_value, u32 flags)
268 {
269 u32 register_value = 0;
270 struct acpi_bit_register_info *bit_reg_info;
271 acpi_status status;
272
273 ACPI_FUNCTION_TRACE(acpi_get_register);
274
275 /* Get the info structure corresponding to the requested ACPI Register */
276
277 bit_reg_info = acpi_hw_get_bit_register_info(register_id);
278 if (!bit_reg_info) {
279 return_ACPI_STATUS(AE_BAD_PARAMETER);
280 }
281
282 /* Read from the register */
283
284 status = acpi_hw_register_read(ACPI_MTX_LOCK,
285 bit_reg_info->parent_register,
286 &register_value);
287
288 if (ACPI_SUCCESS(status)) {
289
290 /* Normalize the value that was read */
291
292 register_value =
293 ((register_value & bit_reg_info->access_bit_mask)
294 >> bit_reg_info->bit_position);
295
296 *return_value = register_value;
297
298 ACPI_DEBUG_PRINT((ACPI_DB_IO, "Read value %8.8X register %X\n",
299 register_value,
300 bit_reg_info->parent_register));
301 }
302
303 return_ACPI_STATUS(status);
304 }
305
306 ACPI_EXPORT_SYMBOL(acpi_get_register)
307
308 /*******************************************************************************
309 *
310 * FUNCTION: acpi_set_register
311 *
312 * PARAMETERS: register_id - ID of ACPI bit_register to access
313 * Value - (only used on write) value to write to the
314 * Register, NOT pre-normalized to the bit pos
315 * Flags - Lock the hardware or not
316 *
317 * RETURN: Status
318 *
319 * DESCRIPTION: ACPI Bit Register write function.
320 *
321 * NOTE: TBD: Flags parameter is obsolete, to be removed
322 *
323 ******************************************************************************/
324 acpi_status acpi_set_register(u32 register_id, u32 value, u32 flags)
325 {
326 u32 register_value = 0;
327 struct acpi_bit_register_info *bit_reg_info;
328 acpi_status status;
329 acpi_cpu_flags lock_flags;
330
331 ACPI_FUNCTION_TRACE_U32(acpi_set_register, register_id);
332
333 /* Get the info structure corresponding to the requested ACPI Register */
334
335 bit_reg_info = acpi_hw_get_bit_register_info(register_id);
336 if (!bit_reg_info) {
337 ACPI_ERROR((AE_INFO, "Bad ACPI HW RegisterId: %X",
338 register_id));
339 return_ACPI_STATUS(AE_BAD_PARAMETER);
340 }
341
342 lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
343
344 /* Always do a register read first so we can insert the new bits */
345
346 status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
347 bit_reg_info->parent_register,
348 &register_value);
349 if (ACPI_FAILURE(status)) {
350 goto unlock_and_exit;
351 }
352
353 /*
354 * Decode the Register ID
355 * Register ID = [Register block ID] | [bit ID]
356 *
357 * Check bit ID to fine locate Register offset.
358 * Check Mask to determine Register offset, and then read-write.
359 */
360 switch (bit_reg_info->parent_register) {
361 case ACPI_REGISTER_PM1_STATUS:
362
363 /*
364 * Status Registers are different from the rest. Clear by
365 * writing 1, and writing 0 has no effect. So, the only relevant
366 * information is the single bit we're interested in, all others should
367 * be written as 0 so they will be left unchanged.
368 */
369 value = ACPI_REGISTER_PREPARE_BITS(value,
370 bit_reg_info->bit_position,
371 bit_reg_info->
372 access_bit_mask);
373 if (value) {
374 status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
375 ACPI_REGISTER_PM1_STATUS,
376 (u16) value);
377 register_value = 0;
378 }
379 break;
380
381 case ACPI_REGISTER_PM1_ENABLE:
382
383 ACPI_REGISTER_INSERT_VALUE(register_value,
384 bit_reg_info->bit_position,
385 bit_reg_info->access_bit_mask,
386 value);
387
388 status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
389 ACPI_REGISTER_PM1_ENABLE,
390 (u16) register_value);
391 break;
392
393 case ACPI_REGISTER_PM1_CONTROL:
394
395 /*
396 * Write the PM1 Control register.
397 * Note that at this level, the fact that there are actually TWO
398 * registers (A and B - and B may not exist) is abstracted.
399 */
400 ACPI_DEBUG_PRINT((ACPI_DB_IO, "PM1 control: Read %X\n",
401 register_value));
402
403 ACPI_REGISTER_INSERT_VALUE(register_value,
404 bit_reg_info->bit_position,
405 bit_reg_info->access_bit_mask,
406 value);
407
408 status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
409 ACPI_REGISTER_PM1_CONTROL,
410 (u16) register_value);
411 break;
412
413 case ACPI_REGISTER_PM2_CONTROL:
414
415 status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
416 ACPI_REGISTER_PM2_CONTROL,
417 &register_value);
418 if (ACPI_FAILURE(status)) {
419 goto unlock_and_exit;
420 }
421
422 ACPI_DEBUG_PRINT((ACPI_DB_IO,
423 "PM2 control: Read %X from %8.8X%8.8X\n",
424 register_value,
425 ACPI_FORMAT_UINT64(acpi_gbl_FADT->
426 xpm2_cnt_blk.address)));
427
428 ACPI_REGISTER_INSERT_VALUE(register_value,
429 bit_reg_info->bit_position,
430 bit_reg_info->access_bit_mask,
431 value);
432
433 ACPI_DEBUG_PRINT((ACPI_DB_IO,
434 "About to write %4.4X to %8.8X%8.8X\n",
435 register_value,
436 ACPI_FORMAT_UINT64(acpi_gbl_FADT->
437 xpm2_cnt_blk.address)));
438
439 status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
440 ACPI_REGISTER_PM2_CONTROL,
441 (u8) (register_value));
442 break;
443
444 default:
445 break;
446 }
447
448 unlock_and_exit:
449
450 acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
451
452 /* Normalize the value that was read */
453
454 ACPI_DEBUG_EXEC(register_value =
455 ((register_value & bit_reg_info->access_bit_mask) >>
456 bit_reg_info->bit_position));
457
458 ACPI_DEBUG_PRINT((ACPI_DB_IO,
459 "Set bits: %8.8X actual %8.8X register %X\n", value,
460 register_value, bit_reg_info->parent_register));
461 return_ACPI_STATUS(status);
462 }
463
464 ACPI_EXPORT_SYMBOL(acpi_set_register)
465
466 /******************************************************************************
467 *
468 * FUNCTION: acpi_hw_register_read
469 *
470 * PARAMETERS: use_lock - Lock hardware? True/False
471 * register_id - ACPI Register ID
472 * return_value - Where the register value is returned
473 *
474 * RETURN: Status and the value read.
475 *
476 * DESCRIPTION: Read from the specified ACPI register
477 *
478 ******************************************************************************/
479 acpi_status
480 acpi_hw_register_read(u8 use_lock, u32 register_id, u32 * return_value)
481 {
482 u32 value1 = 0;
483 u32 value2 = 0;
484 acpi_status status;
485 acpi_cpu_flags lock_flags = 0;
486
487 ACPI_FUNCTION_TRACE(hw_register_read);
488
489 if (ACPI_MTX_LOCK == use_lock) {
490 lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
491 }
492
493 switch (register_id) {
494 case ACPI_REGISTER_PM1_STATUS: /* 16-bit access */
495
496 status =
497 acpi_hw_low_level_read(16, &value1,
498 &acpi_gbl_FADT->xpm1a_evt_blk);
499 if (ACPI_FAILURE(status)) {
500 goto unlock_and_exit;
501 }
502
503 /* PM1B is optional */
504
505 status =
506 acpi_hw_low_level_read(16, &value2,
507 &acpi_gbl_FADT->xpm1b_evt_blk);
508 value1 |= value2;
509 break;
510
511 case ACPI_REGISTER_PM1_ENABLE: /* 16-bit access */
512
513 status =
514 acpi_hw_low_level_read(16, &value1, &acpi_gbl_xpm1a_enable);
515 if (ACPI_FAILURE(status)) {
516 goto unlock_and_exit;
517 }
518
519 /* PM1B is optional */
520
521 status =
522 acpi_hw_low_level_read(16, &value2, &acpi_gbl_xpm1b_enable);
523 value1 |= value2;
524 break;
525
526 case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */
527
528 status =
529 acpi_hw_low_level_read(16, &value1,
530 &acpi_gbl_FADT->xpm1a_cnt_blk);
531 if (ACPI_FAILURE(status)) {
532 goto unlock_and_exit;
533 }
534
535 status =
536 acpi_hw_low_level_read(16, &value2,
537 &acpi_gbl_FADT->xpm1b_cnt_blk);
538 value1 |= value2;
539 break;
540
541 case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */
542
543 status =
544 acpi_hw_low_level_read(8, &value1,
545 &acpi_gbl_FADT->xpm2_cnt_blk);
546 break;
547
548 case ACPI_REGISTER_PM_TIMER: /* 32-bit access */
549
550 status =
551 acpi_hw_low_level_read(32, &value1,
552 &acpi_gbl_FADT->xpm_tmr_blk);
553 break;
554
555 case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */
556
557 status = acpi_os_read_port(acpi_gbl_FADT->smi_cmd, &value1, 8);
558 break;
559
560 default:
561 ACPI_ERROR((AE_INFO, "Unknown Register ID: %X", register_id));
562 status = AE_BAD_PARAMETER;
563 break;
564 }
565
566 unlock_and_exit:
567 if (ACPI_MTX_LOCK == use_lock) {
568 acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
569 }
570
571 if (ACPI_SUCCESS(status)) {
572 *return_value = value1;
573 }
574
575 return_ACPI_STATUS(status);
576 }
577
578 /******************************************************************************
579 *
580 * FUNCTION: acpi_hw_register_write
581 *
582 * PARAMETERS: use_lock - Lock hardware? True/False
583 * register_id - ACPI Register ID
584 * Value - The value to write
585 *
586 * RETURN: Status
587 *
588 * DESCRIPTION: Write to the specified ACPI register
589 *
590 * NOTE: In accordance with the ACPI specification, this function automatically
591 * preserves the value of the following bits, meaning that these bits cannot be
592 * changed via this interface:
593 *
594 * PM1_CONTROL[0] = SCI_EN
595 * PM1_CONTROL[9]
596 * PM1_STATUS[11]
597 *
598 * ACPI References:
599 * 1) Hardware Ignored Bits: When software writes to a register with ignored
600 * bit fields, it preserves the ignored bit fields
601 * 2) SCI_EN: OSPM always preserves this bit position
602 *
603 ******************************************************************************/
604
605 acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value)
606 {
607 acpi_status status;
608 acpi_cpu_flags lock_flags = 0;
609 u32 read_value;
610
611 ACPI_FUNCTION_TRACE(hw_register_write);
612
613 if (ACPI_MTX_LOCK == use_lock) {
614 lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
615 }
616
617 switch (register_id) {
618 case ACPI_REGISTER_PM1_STATUS: /* 16-bit access */
619
620 /* Perform a read first to preserve certain bits (per ACPI spec) */
621
622 status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
623 ACPI_REGISTER_PM1_STATUS,
624 &read_value);
625 if (ACPI_FAILURE(status)) {
626 goto unlock_and_exit;
627 }
628
629 /* Insert the bits to be preserved */
630
631 ACPI_INSERT_BITS(value, ACPI_PM1_STATUS_PRESERVED_BITS,
632 read_value);
633
634 /* Now we can write the data */
635
636 status =
637 acpi_hw_low_level_write(16, value,
638 &acpi_gbl_FADT->xpm1a_evt_blk);
639 if (ACPI_FAILURE(status)) {
640 goto unlock_and_exit;
641 }
642
643 /* PM1B is optional */
644
645 status =
646 acpi_hw_low_level_write(16, value,
647 &acpi_gbl_FADT->xpm1b_evt_blk);
648 break;
649
650 case ACPI_REGISTER_PM1_ENABLE: /* 16-bit access */
651
652 status =
653 acpi_hw_low_level_write(16, value, &acpi_gbl_xpm1a_enable);
654 if (ACPI_FAILURE(status)) {
655 goto unlock_and_exit;
656 }
657
658 /* PM1B is optional */
659
660 status =
661 acpi_hw_low_level_write(16, value, &acpi_gbl_xpm1b_enable);
662 break;
663
664 case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */
665
666 /*
667 * Perform a read first to preserve certain bits (per ACPI spec)
668 *
669 * Note: This includes SCI_EN, we never want to change this bit
670 */
671 status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
672 ACPI_REGISTER_PM1_CONTROL,
673 &read_value);
674 if (ACPI_FAILURE(status)) {
675 goto unlock_and_exit;
676 }
677
678 /* Insert the bits to be preserved */
679
680 ACPI_INSERT_BITS(value, ACPI_PM1_CONTROL_PRESERVED_BITS,
681 read_value);
682
683 /* Now we can write the data */
684
685 status =
686 acpi_hw_low_level_write(16, value,
687 &acpi_gbl_FADT->xpm1a_cnt_blk);
688 if (ACPI_FAILURE(status)) {
689 goto unlock_and_exit;
690 }
691
692 status =
693 acpi_hw_low_level_write(16, value,
694 &acpi_gbl_FADT->xpm1b_cnt_blk);
695 break;
696
697 case ACPI_REGISTER_PM1A_CONTROL: /* 16-bit access */
698
699 status =
700 acpi_hw_low_level_write(16, value,
701 &acpi_gbl_FADT->xpm1a_cnt_blk);
702 break;
703
704 case ACPI_REGISTER_PM1B_CONTROL: /* 16-bit access */
705
706 status =
707 acpi_hw_low_level_write(16, value,
708 &acpi_gbl_FADT->xpm1b_cnt_blk);
709 break;
710
711 case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */
712
713 status =
714 acpi_hw_low_level_write(8, value,
715 &acpi_gbl_FADT->xpm2_cnt_blk);
716 break;
717
718 case ACPI_REGISTER_PM_TIMER: /* 32-bit access */
719
720 status =
721 acpi_hw_low_level_write(32, value,
722 &acpi_gbl_FADT->xpm_tmr_blk);
723 break;
724
725 case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */
726
727 /* SMI_CMD is currently always in IO space */
728
729 status = acpi_os_write_port(acpi_gbl_FADT->smi_cmd, value, 8);
730 break;
731
732 default:
733 status = AE_BAD_PARAMETER;
734 break;
735 }
736
737 unlock_and_exit:
738 if (ACPI_MTX_LOCK == use_lock) {
739 acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
740 }
741
742 return_ACPI_STATUS(status);
743 }
744
745 /******************************************************************************
746 *
747 * FUNCTION: acpi_hw_low_level_read
748 *
749 * PARAMETERS: Width - 8, 16, or 32
750 * Value - Where the value is returned
751 * Reg - GAS register structure
752 *
753 * RETURN: Status
754 *
755 * DESCRIPTION: Read from either memory or IO space.
756 *
757 ******************************************************************************/
758
759 acpi_status
760 acpi_hw_low_level_read(u32 width, u32 * value, struct acpi_generic_address *reg)
761 {
762 u64 address;
763 acpi_status status;
764
765 ACPI_FUNCTION_NAME(hw_low_level_read);
766
767 /*
768 * Must have a valid pointer to a GAS structure, and
769 * a non-zero address within. However, don't return an error
770 * because the PM1A/B code must not fail if B isn't present.
771 */
772 if (!reg) {
773 return (AE_OK);
774 }
775
776 /* Get a local copy of the address. Handles possible alignment issues */
777
778 ACPI_MOVE_64_TO_64(&address, &reg->address);
779 if (!address) {
780 return (AE_OK);
781 }
782 *value = 0;
783
784 /*
785 * Two address spaces supported: Memory or IO.
786 * PCI_Config is not supported here because the GAS struct is insufficient
787 */
788 switch (reg->address_space_id) {
789 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
790
791 status = acpi_os_read_memory((acpi_physical_address) address,
792 value, width);
793 break;
794
795 case ACPI_ADR_SPACE_SYSTEM_IO:
796
797 status = acpi_os_read_port((acpi_io_address) address,
798 value, width);
799 break;
800
801 default:
802 ACPI_ERROR((AE_INFO,
803 "Unsupported address space: %X",
804 reg->address_space_id));
805 return (AE_BAD_PARAMETER);
806 }
807
808 ACPI_DEBUG_PRINT((ACPI_DB_IO,
809 "Read: %8.8X width %2d from %8.8X%8.8X (%s)\n",
810 *value, width,
811 ACPI_FORMAT_UINT64(address),
812 acpi_ut_get_region_name(reg->address_space_id)));
813
814 return (status);
815 }
816
817 /******************************************************************************
818 *
819 * FUNCTION: acpi_hw_low_level_write
820 *
821 * PARAMETERS: Width - 8, 16, or 32
822 * Value - To be written
823 * Reg - GAS register structure
824 *
825 * RETURN: Status
826 *
827 * DESCRIPTION: Write to either memory or IO space.
828 *
829 ******************************************************************************/
830
831 acpi_status
832 acpi_hw_low_level_write(u32 width, u32 value, struct acpi_generic_address * reg)
833 {
834 u64 address;
835 acpi_status status;
836
837 ACPI_FUNCTION_NAME(hw_low_level_write);
838
839 /*
840 * Must have a valid pointer to a GAS structure, and
841 * a non-zero address within. However, don't return an error
842 * because the PM1A/B code must not fail if B isn't present.
843 */
844 if (!reg) {
845 return (AE_OK);
846 }
847
848 /* Get a local copy of the address. Handles possible alignment issues */
849
850 ACPI_MOVE_64_TO_64(&address, &reg->address);
851 if (!address) {
852 return (AE_OK);
853 }
854
855 /*
856 * Two address spaces supported: Memory or IO.
857 * PCI_Config is not supported here because the GAS struct is insufficient
858 */
859 switch (reg->address_space_id) {
860 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
861
862 status = acpi_os_write_memory((acpi_physical_address) address,
863 value, width);
864 break;
865
866 case ACPI_ADR_SPACE_SYSTEM_IO:
867
868 status = acpi_os_write_port((acpi_io_address) address,
869 value, width);
870 break;
871
872 default:
873 ACPI_ERROR((AE_INFO,
874 "Unsupported address space: %X",
875 reg->address_space_id));
876 return (AE_BAD_PARAMETER);
877 }
878
879 ACPI_DEBUG_PRINT((ACPI_DB_IO,
880 "Wrote: %8.8X width %2d to %8.8X%8.8X (%s)\n",
881 value, width,
882 ACPI_FORMAT_UINT64(address),
883 acpi_ut_get_region_name(reg->address_space_id)));
884
885 return (status);
886 }
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